// 官方demo,单词列表+交互喜欢+路由跳转
import 'package:flutter/material.dart';
import 'package:english_words/english_words.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // final wordPair = new WordPair.random();
    return new MaterialApp(
      title: 'Flutter MaterialApp',
      theme: ThemeData(
        primaryColor: Colors.white,
      ),
      home: RandomWords(),
    );
  }
}

class RandomWords extends StatefulWidget {
  @override
  createState() => new RandomWordsState();
}

class RandomWordsState extends State<RandomWords> {
  final _suggestions = <WordPair>[];
  final _saved = new Set<WordPair>();
  final _biggerFont = const TextStyle(fontSize: 18.0);
  @override
  Widget _buildSuggestions() {
    return new ListView.builder(
      padding: const EdgeInsets.all(16.0),
      itemBuilder: (context, i) {
        if (i.isOdd) return new Divider();
        final index = i ~/ 2;
        if (index >= _suggestions.length) {
          _suggestions.addAll(generateWordPairs().take(10));
        }
        return _buildRow(_suggestions[index]);
      },
    );
  }
  Widget _buildRow(WordPair pair) {
    final alreadySaved = _saved.contains(pair);
    return new ListTile(
      title: Text(
        pair.asPascalCase,
        style: _biggerFont,
      ),
      trailing: new Icon(
        alreadySaved ? Icons.favorite : Icons.favorite_border,
        color: alreadySaved ? Colors.red : null
      ),
      onTap: () {
        setState(() {
          if (alreadySaved) {
            _saved.remove(pair);
          } else {
            _saved.add(pair);
          }
        });
      },
    );
  }
  void _pushSaved () {
    Navigator.of(context).push(
      MaterialPageRoute(
        builder: (context) {
          final tiles = _saved.map(
            (pair) {
              return ListTile(
                title: Text(pair.asPascalCase, style: _biggerFont),
              );
            }
          );
          final divided = ListTile.divideTiles(
            context: context,
            tiles: tiles
          ).toList();
          return Scaffold(
            appBar: AppBar(title: Text('Saved Suggesstions')),
            body: ListView(children: divided)
          );
        }
      )
    );
  }
  Widget build(BuildContext context) {
    // final wordPair = new WordPair.random();
    // return Text(wordPair.asPascalCase);
    return new Scaffold(
      appBar: AppBar(
        title: Text('Startup Name Generator'),
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.list),
            onPressed: _pushSaved,
          )
        ],
      ),
      body: _buildSuggestions(),
    );
  }
}